| A | B |
|---|
| Galaxy | A System of billions of stars, gases, and dust |
| Cluster | Groups of galaxys |
| Quasars | Brilliant objects in space that may be the power house of developing galaxies |
| Nebula | Cloud of dust and gas in space |
| Red Giant | A star that swelled and glows with a red color |
| Supernova | The explosion of a star, releasing huge amounts of light and other energy |
| Black Hole | An invisible object in space whose mass and gravitational force is great that not even light can escape |
| Big Bang Theory | The idea that the universe started a huge explosion about 15 billion years ago |
| Red Shift | The change of light waves from retreating objects to the red end of the spectrum |
